28
360 DVS Series Direct Vent Fireplaces
10006326
NOTE: Before troubleshooting the gas control system, be sure external gas shut off is in the “On” position.
SIT NOVA 820 MILLIVOLT VALVE
Troubleshooting the Gas Control System
WARNING: REMOVE GLASS FRONT BEFORE DOING ANY GAS CONTROL SERVICE WORK.
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
1. Spark ignitor will not light
A. Defective or misaligned
Using a match, light pilot. If pilot lights, turn off
electrode at pilot.
pilot and push the red button again. If pilot will not
light, check the gap at electrode and pilot; it should
be 1/8" to have a strong spark.
B. Defective ignitor (Push Button)
Push piezo Ignitor Button. Check for spark at
electrode and pilot. If no spark to pilot, and electode
wire is properly connected, replace ignitor.
2. Pilot will not stay lit after
A. Defective pilot generator
Check pilot flame. Must impinge on thermocouple/
carefully following lighting
(thermocouple), remote wall
thermopile. NOTE: This pilot burner assembly
instructions.
switch.
utilizes both a thermocouple and a thermopile.
The thermocouple operates the main valve operation
(ON/ OFF). Clean and/or adjust pilot for maximum
flame impingement on thermopile and thermocouple.
B. Defective automatic valve
Turn valve knob to “Pilot.” Maintain flow to pilot;
millivolt meter should read greater than 10 mV. If
the reading is okay and the pilot does not stay on,
replace the gas valve. NOTE: An interrupter block
(not supplied) must be used to conduct this test.
3. Pilot burning, no gas to
A. Wall switch or wires defective
Check wall switch and wires for proper connections
main burner
Jumper wire across terminals at wall switch; if burner
comes on, replace defective wall switch. If okay,
jumper wires across wall switch wires at valve; if
burner comes on, wires are faulty or connections are
bad.
B. Thermopile may not be
1. Be sure wire connections from thermopile at
generating sufficient
gas valve terminals are tight and thermopile is
millivoltage.
fully inserted into pilot bracket.
2. One of the wall switch wires may be grounded.
Remove wall switch wires from valve terminals if
pilot now stays lit, trace wall switch wiring for
ground. May be grounded to fireplace or gas
supply.
3. Check thermopile with millivolt meter. Take
reading at thermopile terminals of gas valve—
should read 250-300 millivolts (minimum 150)
while holding valve knob depressed in pilot
position and wall switch “OFF.” Replace faulty
thermopile if reading is below specified minimum.
C. Plugged burner orifice.
Check burner orifices for debris and remove.
D. Defective automatic valve
Turn valve knob to “ON,” place wall switch to “ON” —
operator.
millivolt meter should read greater than 100 mV. If
the reading is okay and the burner does not come
on, replace the gas valve.
4. Frequent pilot outage
A. Pilot flame may be too low
Clean and/or adjust pilot flame for maximum flame
problem.
or blowing (high) causing the
impingement on thermopile and thermocouple.
pilot safety to drop out.
B. Possible blockage of the vent
Check the vent terminal for blockage (recycling the
terminal.
flue gases)
